[wp-trac] [WordPress Trac] #14468: Shortcode usage causes blog texts to not be output

[WordPress Trac]

#14468: Shortcode usage causes blog texts to not be output
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 Reporter:  cymric        |       Owner:                 
     Type:  defect (bug)  |      Status:  new            
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Shortcodes    |     Version:  3.0            
 Severity:  normal        |    Keywords:                 
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 '''System configuration''': PHP 5.2.12 + Zend 2.2.0 running on SunOS 5.10;
 Wordpress 3.0 + Atahualpa 3.4.4 / 'STRATO Default' 1.5 (= based largely on
 Kubrick; STRATO is my webhost)

 '''Problem''': adding the following code to the theme's functions.php
 ('foto' is Dutch for 'photo', 'fout' = 'error')
 {{{
 function shortcode_foto($atts, $content, $code)
 {
         return '<span style="color:
 red;"><strong>[FOTOFOUT]</strong></span>';
 }
 add_shortcode('foto', 'shortcode_foto');
 }}}
 and then using the shortcode [foto] in blogtext can result in the blog
 text itself disappearing completely from the screen. It is simply not
 output by Wordpress. The rest of the page looks normal, no missing
 content, no CSS errors, comments (if there are any) appear normal. After
 many trial and error I was able to create a text where the addition of a
 ''single'' letter to the last word in a very normal HTML-paragraph of text
 means the difference between visible text and non-visible text.

 '''Switching themes''': Switching to a different theme, taking care to
 code the same few lines in the appropriate functions.php file, made no
 difference. The test cases behaved identically: the post disappeared when
 asked to view the text with one letter extra.

 '''Using a different method of introducing the shortcode to Wordpress''':
 Originally I wanted to have the code wrapped as a plugin. This already
 caused the behaviour I reported above. Thinking the instantiation method
 was awry I coded it in a different way, which made no difference. The
 functions.php-approach is the third attempt to get the code working. At
 this point I believe the problem is not related to how I hook the
 shortcode into the system.

 '''Using a different version of Wordpress''': Originally I started out
 with WP 2.8.5 where the bug raised its head too. I upgraded to WP 3.0,
 noticing but one difference: I could make the text slightly longer before
 the problem was triggered.

 '''Adding text before the first use of the shortcode''': I can add as much
 text as I want to the texts before the moment I first use the shortcode
 without triggering the problem. It is only ''after'' the shortcodes are
 used that the issue appears.

 '''Multiple uses of the shortcode''': I have some documents where the
 shortcode is used more than the two times of the test cases (4 to 5
 times), and those texts are rendered without problem.

 '''Access to the test cases''': Since I'm still working on a trial blog,
 copying over content from an older blog, I do not want to name the URL in
 public just yet; also I've added some simple HTTP Auth protection. Please
 contact me via email to get the necessary login information.

 '''Possible causes''': For the moment I am not sure whether the problem
 resides with WP or PHP. Unfortunately I cannot change the PHP interpreter.

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Ticket URL: <http://core.trac.wordpress.org/ticket/14468>
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